Question 1

Which of the following (n, ?, mS1U1B1lS1U1B0 , mS1U1B1sS1U1B0) combinations is impossible for an electron in an atom?

Accepted Answer

A)  3, 1, 1, -1/2 
B)  6, 2, 0, 1/2 
C)  3, 2, -2, -1/2 
D)  3, 1, -2, 1/2 
E)  1, 0, 0, -1/2 
A)  3, 1, 1, -1/2 
B)  6, 2, 0, 1/2 
C)  3, 2, -2, -1/2 
D)  3, 1, -2, 1/2 
E)  1, 0, 0, -1/2

Question 2

The Stern-Gerlach experiment makes use of:

Accepted Answer

A)  a strong uniform magnetic field 
B)  a strong non-uniform magnetic field 
C)  a strong uniform electric field 
D)  a strong non-uniform electric field 
E)  strong perpendicular electric and magnetic fields 
A)  a strong uniform magnetic field 
B)  a strong non-uniform magnetic field 
C)  a strong uniform electric field 
D)  a strong non-uniform electric field 
E)  strong perpendicular electric and magnetic fields

Question 3

The possible values for the magnetic quantum number ms of an electron in an atom:

Accepted Answer

A)  depend on n 
B)  depend on ℓ 
C)  depend on both n and ℓ 
D)  depend on whether or not there is an external magnetic field present 
E)  are $\pm$1/2 
A)  depend on n 
B)  depend on ℓ 
C)  depend on both n and ℓ 
D)  depend on whether or not there is an external magnetic field present 
E)  are $\pm$1/2

Question 4

Photons in a laser beam are produced by:

Accepted Answer

A)  transitions from a metastable state 
B)  transitions from a state that decays rapidly 
C)  splitting of other photons 
D)  pumping 
E)  reflection from mirrors 
A)  transitions from a metastable state 
B)  transitions from a state that decays rapidly 
C)  splitting of other photons 
D)  pumping 
E)  reflection from mirrors

Question 5

The magnitude of the orbital magnetic dipole moment of an atom is ($\mu$B is the Bohr magneton, and ℓ is a positive integer):

Accepted Answer

A)  $\mu$B 
B)  $\mu$B ℓ 
C)    
D)  $\mu$B (2ℓ+1) 
E)  $\mu$B ℓ2 
A)  $\mu$B 
B)  $\mu$B ℓ 
C)    
D)  $\mu$B (2ℓ+1) 
E)  $\mu$B ℓ2

Question 6

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

Accepted Answer

A)  each is produced in an emission that is stimulated by another 
B)  all come from the same atom 
C)  the lasing material has only two quantum states 
D)  all photons are alike, no matter what their source 
E)  none of the above 
A)  each is produced in an emission that is stimulated by another 
B)  all come from the same atom 
C)  the lasing material has only two quantum states 
D)  all photons are alike, no matter what their source 
E)  none of the above

Question 7

A laser beam can be sharply focused because it is:

Accepted Answer

A)  highly coherent 
B)  plane polarized 
C)  intense 
D)  circularly polarized 
E)  highly directional 
A)  highly coherent 
B)  plane polarized 
C)  intense 
D)  circularly polarized 
E)  highly directional

Question 8

Possible values of the principal quantum number n for an electron in an atom are:

Accepted Answer

A)  only 0 and 1 
B)  only 0,1,2,..., $\infty$ 
C)  only 0,1,..., ℓ−1 
D)  only 1/2 and -1/2 
E)  only 1,2,3,...,$\infty$ 
A)  only 0 and 1 
B)  only 0,1,2,..., $\infty$ 
C)  only 0,1,..., ℓ−1 
D)  only 1/2 and -1/2 
E)  only 1,2,3,...,$\infty$

Question 9

Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 F*1020 atoms in the metastable state and 2 * 1020 atoms in the ground state. The number of photons that can be produced in a single burst is about:

Accepted Answer

A)  2 * 1020 
B)  3 *1020 
C)  4 * 1020 
D)  6 * 1020 
E)  8 * 1020 
A)  2 * 1020 
B)  3 *1020 
C)  4 * 1020 
D)  6 * 1020 
E)  8 * 1020

Question 10

The total number of electron states with n = 2 and ℓ=1 for an atom is:

Accepted Answer

A)  2 
B)  4 
C)  6 
D)  8 
E)  10 
A)  2 
B)  4 
C)  6 
D)  8 
E)  10

Question 11

The ratio of wavelength of K $\infty$  x-ray line for Nb (Z = 41) to that of Ga (Z = 31) is:

Accepted Answer

A)  9/16 
B)  16/9 
C)  3/4 
D)  4/3 
E)  1.15 
A)  9/16 
B)  16/9 
C)  3/4 
D)  4/3 
E)  1.15

Question 12

The group of atoms at the ends of periods of the periodic table is called:

Accepted Answer

A)  alkali metal atoms 
B)  rare earth atoms 
C)  transition metal atoms 
D)  alkaline atoms 
E)  noble gas atoms 
A)  alkali metal atoms 
B)  rare earth atoms 
C)  transition metal atoms 
D)  alkaline atoms 
E)  noble gas atoms

Question 13

A photon with the smallest wavelength in the continuous z-ray spectrum is emitted when:

Accepted Answer

A)  an electron is knocked from a K shell 
B)  a valence electron is knocked from the atom 
C)  the incident electron becomes bound to the atom 
D)  the atom has the greatest recoil energy 
E)  the incident electron loses all its energy in a single decelerating event 
A)  an electron is knocked from a K shell 
B)  a valence electron is knocked from the atom 
C)  the incident electron becomes bound to the atom 
D)  the atom has the greatest recoil energy 
E)  the incident electron loses all its energy in a single decelerating event

Question 14

No state in an atom can be occupied by more than one electron. This is most closely related to the:

Accepted Answer

A)  wave nature of matter 
B)  finite value for the speed of light 
C)  Bohr magneton 
D)  Pauli exclusion principle 
E)  the Einstein-de Haas effect 
A)  wave nature of matter 
B)  finite value for the speed of light 
C)  Bohr magneton 
D)  Pauli exclusion principle 
E)  the Einstein-de Haas effect

Question 15

An electron in a K shell of an atom has the principal quantum number:

Accepted Answer

A)  n = 0 
B)  n = 1 
C)  n = 2 
D)  n = 3 
E)  n = $\infty$ 
A)  n = 0 
B)  n = 1 
C)  n = 2 
D)  n = 3 
E)  n = $\infty$

Question 16

In a laser:

Accepted Answer

A)  excited atoms are stimulated to emit photons by radiation external to the laser 
B)  the transitions for laser emission are directly to the ground state 
C)  the states which give rise to laser emission are usually very unstable states that decay rapidly 
D)  the state in which an atom is initially excited is never between two states that are involved in the stimulated emission 
E)  a minimum of two energy levels are required. 
A)  excited atoms are stimulated to emit photons by radiation external to the laser 
B)  the transitions for laser emission are directly to the ground state 
C)  the states which give rise to laser emission are usually very unstable states that decay rapidly 
D)  the state in which an atom is initially excited is never between two states that are involved in the stimulated emission 
E)  a minimum of two energy levels are required.

Question 17

Suppose the energy required to ionize a neon atom is i, the energy to excite it is e, and its energy due to thermal agitation at room temperature is t. In increasing order, these three energies are:

Accepted Answer

A)  i, e, t 
B)  t, i, e 
C)  e, t, i 
D)  i, t, e 
E)  t, e, i 
A)  i, e, t 
B)  t, i, e 
C)  e, t, i 
D)  i, t, e 
E)  t, e, i

Question 18

An atom is in a state with orbital quantum number ℓ=2. Possible values of the magnetic quantum number mℓ are:

Accepted Answer

A)  1, 2 
B)  0, 1, 2 
C)  0, 1 
D)  -1, 0, 1 
E)  -2, -1, 0, 1, 2 
A)  1, 2 
B)  0, 1, 2 
C)  0, 1 
D)  -1, 0, 1 
E)  -2, -1, 0, 1, 2

Question 19

Characteristic K x-radiation of an element is caused by:

Accepted Answer

A)  stoppage of electrons by the nucleus 
B)  scattering of the incident radiation with a change of wavelength 
C)  ejection of an electron from an outer shell 
D)  transition of an electron to the innermost orbit 
E)  none of the above 
A)  stoppage of electrons by the nucleus 
B)  scattering of the incident radiation with a change of wavelength 
C)  ejection of an electron from an outer shell 
D)  transition of an electron to the innermost orbit 
E)  none of the above

Question 20

Hydrogen atoms are in a magnetic field of 2.0 T. What is their magnetic resonance frequency?

Accepted Answer

A)  2.8 x 1010 Hz 
B)  5.6 x 1010 Hz 
C)  1.1 x 1011 Hz 
D)  1.8 x 1011 Hz 
E)  3.5 x 1011 Hz 
A)  2.8 x 1010 Hz 
B)  5.6 x 1010 Hz 
C)  1.1 x 1011 Hz 
D)  1.8 x 1011 Hz 
E)  3.5 x 1011 Hz

Exam 40: All About Atoms

Which of the following (n, ?, ml , ms) combinations is impossible for an electron in an atom?

The Stern-Gerlach experiment makes use of:

The possible values for the magnetic quantum number ms of an electron in an atom:

Photons in a laser beam are produced by:

The magnitude of the orbital magnetic dipole moment of an atom is ( μ\muμ B is the Bohr magneton, and ℓ is a positive integer):

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

A laser beam can be sharply focused because it is:

Possible values of the principal quantum number n for an electron in an atom are:

Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 F*1020 atoms in the metastable state and 2 * 1020 atoms in the ground state. The number of photons that can be produced in a single burst is about:

The total number of electron states with n = 2 and ℓ=1 for an atom is:

The ratio of wavelength of K ∞\infty∞ x-ray line for Nb (Z = 41) to that of Ga (Z = 31) is:

The group of atoms at the ends of periods of the periodic table is called:

A photon with the smallest wavelength in the continuous z-ray spectrum is emitted when:

No state in an atom can be occupied by more than one electron. This is most closely related to the:

An electron in a K shell of an atom has the principal quantum number:

In a laser:

Suppose the energy required to ionize a neon atom is i, the energy to excite it is e, and its energy due to thermal agitation at room temperature is t. In increasing order, these three energies are:

An atom is in a state with orbital quantum number ℓ=2. Possible values of the magnetic quantum number mℓ are:

Characteristic K x-radiation of an element is caused by:

Hydrogen atoms are in a magnetic field of 2.0 T. What is their magnetic resonance frequency?

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Which of the following (n, ?, m_l , m_s) combinations is impossible for an electron in an atom?

The possible values for the magnetic quantum number m_s of an electron in an atom:

The magnitude of the orbital magnetic dipole moment of an atom is ( $\mu$ _B is the Bohr magneton, and ℓ is a positive integer):

Electrons in a certain laser make transitions from a metastable state to the ground state. Initially there are 6 F10²⁰ atoms in the metastable state and 2 10²⁰ atoms in the ground state. The number of photons that can be produced in a single burst is about:

The ratio of wavelength of K _$\infty$ x-ray line for Nb (Z = 41) to that of Ga (Z = 31) is:

An atom is in a state with orbital quantum number ℓ=2. Possible values of the magnetic quantum number m_ℓ are: